Rust error E0576: cannot find associated type `You` in trait `Hello`

What rustc prints

error[E0576]: cannot find associated type `You` in trait `Hello`
 --> main.rs:4:36
  |
2 |     type Who;
  |     --------- associated type `Who` defined here
3 |
4 |     fn hello() -> <Self as Hello>::You; // error!
  |                                    ^^^ not found in `Hello`
  |
help: maybe you meant this associated type
  |
4 -     fn hello() -> <Self as Hello>::You; // error!
4 +     fn hello() -> <Self as Hello>::Who; // error!
  |

Real output of rustc 1.99.0 compiling the official example below (2021 edition). Your names and line numbers will differ; the first line is the part to match.

trait Hello {
    type Who;

    fn hello() -> <Self as Hello>::You; // error!
}

trait Hello {
    type Who;

    fn hello() -> <Self as Hello>::Who; // ok!
}

Related errors

• E0308mismatched types
• E0277the trait bound is not satisfied
• E0599no method named X found in the current scope
• E0433failed to resolve
• E0574expected struct, variant or union type, found module `mordor`
• E0575cannot find associated type `Mythology` in trait `Age`
• E0579lower bound for range pattern must be less than upper bound
• E0580`main` function has wrong type

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